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Note 9 - Fair Value - Fair Values for Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Trading securities		$ 83,100,805
Trading securities, realized gain (loss)	6,406
Trading securities, unrealized gain (loss)	(132,191)
Securities available for sale, realized gain (loss)	739,589
Securities available for sale, unrealized gain (loss)	116,796
Realized gain (loss)	745,995
Unrealized gain (loss)	(15,395)	$ 132,191
Reported Value Measurement [Member]
Trading securities
Securities available for sale	86,845,386
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Trading securities
Securities available for sale	$ 86,845,386

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
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+ References

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-Topic 320
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+ References

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-SubTopic 10
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-Paragraph 2
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+ References

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+ References

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